All versions of the the SDK should allow you to execute the predict command so long as your executing your search in the correct app context.
For example when you're setting up your search in code you might have the search string like this:
job = await service.Jobs.CreateAsync("search index=_internal | head 10");
There's no reason you couldnt use a search with the predict command here. The only issue may be if predict command is in searching and reporting app only, and your API user doesnt have access to it, etc.
